Johto is one of the mainland regions that is currently playable in Pokémon Revolution Online. It is unified to the same mainland continent as Kanto, encompassing the western segment of it.

By virtue of the regional linearity of the game's storyline wherein regions are traveled to in generational succession, it is the second region that players venture into. It's the neighboring region near Kanto, which will be made traveable after all-eight Kanto's badges have been acquired and its Elite Four bureau has been vanquished.

It is inhabitated predominantly by Generation II Pokémon, being the native land of them. While a smattering of post-generational Pokémon are interspersed throughout the wild, Generation III Pokémon and onwards will be mostly inacquirable until successive regions are completed, since there is a regionalized restriction to trading early on wherein only Pokémon caught from the region are tradable in its Pokémon Centers.